ESSAY. Breakdown and explain the motion of a projectile enumerating the relation of its components to a rectilinear motion.

can you write step clearly

I am confused because on my homework i got marked wrong for this, unless I used to many sig figs.

a) As given in the figure, water flowing into a tank at a constant speed fills the tank up to h = 3 m height in 5 minutes. If the long side of the rectangular tank is 2 m and the short side is 1.5 m, calculate the average velocity of the water at 30 ° C flowing from the 0.2 m diameter pipe at point A as [m / s] and its flow rate as [kg / s]. b) Water flows into the pipe at a constant average velocity of 0.5 m / s. In this framework, determine the relationship between the time (t) required to fill the tank at h = 3 m depth and the pipe diameter (D) at point A.  (Take the width of the warehouse as 1.5 m). Plot the graph of (minutes) -D (m). (Let D be on the horizontal axis as 0.05 m, 0.1 m, 0.15 m, 0.20 m and 0.25 m)